Alliant Techsystems Inc.

WASHINGTON — NASA made official on Wednesday its next vision for space travel by unveiling plans for a massive rocket it hopes could blast astronauts to an asteroid by 2025 while laying the foundation for a future trip to Mars.

The new rocket, a hybrid of the space shuttle, would cost at least $30 billion through 2021 and was billed by NASA as the most powerful in its history, more robust than even the Saturn V rocket that carried Apollo astronauts to the moon. The agency has targeted an unmanned test flight for 2017 with a second, crewed flight in 2021, though no destination has been selected for either flight.

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WASHINGTON — NASA made official on Wednesday its next vision for space travel by unveiling plans for a massive rocket it hopes could blast astronauts to an asteroid by 2025 while laying the foundation for a future trip to Mars.
The new rocket, a...